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Update 2.6.x-xfs to 2.6.23-rc4.

Also update fs/xfs with external mainline changes.
There were 12 such missing commits that I detected:

--------
commit ad690ef9e690f6c31f7d310b09ef1314bcec9033
Author: Al Viro <viro@ftp.linux.org.uk>
    xfs ioctl __user annotations

commit 20c2df83d25c6a95affe6157a4c9cac4cf5ffaac
Author: Paul Mundt <lethal@linux-sh.org>
    mm: Remove slab destructors from kmem_cache_create().

commit d0217ac04ca6591841e5665f518e38064f4e65bd
Author: Nick Piggin <npiggin@suse.de>
    mm: fault feedback #1

commit 54cb8821de07f2ffcd28c380ce9b93d5784b40d7
Author: Nick Piggin <npiggin@suse.de>
    mm: merge populate and nopage into fault (fixes nonlinear)

commit d00806b183152af6d24f46f0c33f14162ca1262a
Author: Nick Piggin <npiggin@suse.de>
    mm: fix fault vs invalidate race for linear mappings

commit a569425512253992cc64ebf8b6d00a62f986db3e
Author: Christoph Hellwig <hch@infradead.org>
    knfsd: exportfs: add exportfs.h header

commit 831441862956fffa17b9801db37e6ea1650b0f69
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Freezer: make kernel threads nonfreezable by default

commit 8e1f936b73150f5095448a0fee6d4f30a1f9001d
Author: Rusty Russell <rusty@rustcorp.com.au>
    mm: clean up and kernelify shrinker registration

commit 5ffc4ef45b3b0a57872f631b4e4ceb8ace0d7496
Author: Jens Axboe <jens.axboe@oracle.com>
    sendfile: remove .sendfile from filesystems that use generic_file_sendfile()

commit 8bb7844286fb8c9fce6f65d8288aeb09d03a5e0d
Author: Rafael J. Wysocki <rjw@sisk.pl>
    Add suspend-related notifications for CPU hotplug

commit 59c51591a0ac7568824f541f57de967e88adaa07
Author: Michael Opdenacker <michael@free-electrons.com>
    Fix occurrences of "the the "

commit 0ceb331433e8aad9c5f441a965d7c681f8b9046f
Author: Dmitriy Monakhov <dmonakhov@openvz.org>
    mm: move common segment checks to separate helper function
--------
Merge of 2.6.x-xfs-melb:linux:29656b by kenmcd.

#ifndef _X86_64_PTRACE_H
#define _X86_64_PTRACE_H

#include <linux/compiler.h>	/* For __user */
#include <asm/ptrace-abi.h>

#ifndef __ASSEMBLY__

struct pt_regs {
	unsigned long r15;
	unsigned long r14;
	unsigned long r13;
	unsigned long r12;
	unsigned long rbp;
	unsigned long rbx;
/* arguments: non interrupts/non tracing syscalls only save upto here*/
 	unsigned long r11;
	unsigned long r10;
	unsigned long r9;
	unsigned long r8;
	unsigned long rax;
	unsigned long rcx;
	unsigned long rdx;
	unsigned long rsi;
	unsigned long rdi;
	unsigned long orig_rax;
/* end of arguments */
/* cpu exception frame or undefined */
	unsigned long rip;
	unsigned long cs;
	unsigned long eflags;
	unsigned long rsp;
	unsigned long ss;
/* top of stack page */
};

#endif

#if defined(__KERNEL__) && !defined(__ASSEMBLY__) 
#define user_mode(regs) (!!((regs)->cs & 3))
#define user_mode_vm(regs) user_mode(regs)
#define instruction_pointer(regs) ((regs)->rip)
#define regs_return_value(regs) ((regs)->rax)

extern unsigned long profile_pc(struct pt_regs *regs);
void signal_fault(struct pt_regs *regs, void __user *frame, char *where);

struct task_struct;

extern unsigned long
convert_rip_to_linear(struct task_struct *child, struct pt_regs *regs);

enum {
        EF_CF   = 0x00000001,
        EF_PF   = 0x00000004,
        EF_AF   = 0x00000010,
        EF_ZF   = 0x00000040,
        EF_SF   = 0x00000080,
        EF_TF   = 0x00000100,
        EF_IE   = 0x00000200,
        EF_DF   = 0x00000400,
        EF_OF   = 0x00000800,
        EF_IOPL = 0x00003000,
        EF_IOPL_RING0 = 0x00000000,
        EF_IOPL_RING1 = 0x00001000,
        EF_IOPL_RING2 = 0x00002000,
        EF_NT   = 0x00004000,   /* nested task */
        EF_RF   = 0x00010000,   /* resume */
        EF_VM   = 0x00020000,   /* virtual mode */
        EF_AC   = 0x00040000,   /* alignment */
        EF_VIF  = 0x00080000,   /* virtual interrupt */
        EF_VIP  = 0x00100000,   /* virtual interrupt pending */
        EF_ID   = 0x00200000,   /* id */
};

#endif

#endif